Comtech EF Data SDM-300L3 - Manual (Page 251)

SDM-300L3 Satellite Modem Revision 1
Fault Isolation MN/SDM300L3.IOM
9–3
9.1.3.1 Faults Tree
Refer to Figure 9-1 for faults monitored by the modem, and the action taken at each
occurrence of that fault.
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MODULATOR FAULTS
IF SYNTHESIZER X X X X X X
DATA CLOCK SYN X X X X X X
I CHANNEL X X X X X X
Q CHANNEL X X X X X X
AGC X X X X X X
MODEM REF ACT X X
MODULE X X X X X X
CONFIGURATION X X X X X X
MODEM REF PLL X X X X X X
DEMODULATOR FAULTS
CARRIER DETECT X X X X X
IF SYNTHESIZER X X X X X
I CHANNEL X X X X X
Q CHANNEL X X X X X
BER THRESHOLD X X X X
MODULE X X X X X
CONFIGURATION X X X X X
LNB CURRENT X X X X
OUTDOOR UNIT (BUC)
CURRENT X X
VOLTAGE
TEMPERATURE (FSK MODE ON)
PLL LOCK (FSK MODE ON) X X X
CHECKSUM (FSK MODE ON)
F IGURE 9-1. SDM-300L F AULT T REE